a Hornet is a Imperial Armory unit - they are wicket. Basically a cross between a warwalker, horner, and Wave Serpent.
A 11 11 10, BS3, take 2 guns and any vehicle upgrade. Not open-topped, don't transport, take 1-3 like Vypers.
They can get any heavy gun INCLUDING Pulse Lasers, which makes them 125 points glass cannons with 4 S8 AP2 48" shots. Expensive, but ultra nasty.
I agree with Rob, your going to get out-gunned. Please tell us what the tanks have, gun-wise.
DAMN YOU, DICE GODS!